Piston Squirters
01-27-2004, 04:51 PM
#48
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Jim wrote:
Now don't be all trying to get in my good side here Jim, I still don't know if I forgive you for referring to Black/black S4 A/T's as "boring" in that other post. 
It took all the effort I could muster not to tear down the pin up I have of you lying across the hood of the very brown 928 being fed peeled grapes and being fanned by a palm leaf by all those scantily clad women. 
Actually your point is exactly what I was thinking. Are we A/T drivers once again left holding the bag for some perceived mis-design by the Porsche engineers, only to show the superiority of the product in the long run?
Adam interesting thought ....perhaps they "wanted " to get the squirters out of the 5 speed cars first ?? maybe because they get driven more often at high RPM ?
It took all the effort I could muster not to tear down the pin up I have of you lying across the hood of the very brown 928 being fed peeled grapes and being fanned by a palm leaf by all those scantily clad women. Actually your point is exactly what I was thinking. Are we A/T drivers once again left holding the bag for some perceived mis-design by the Porsche engineers, only to show the superiority of the product in the long run?
01-27-2004, 05:22 PM
#54
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Dry sumping is good for additional hp too, about 4-7 per liter, so for a 6.5, you should have an additional 30-40 bhp. Hmm, maybe time to add dry sump to the next intake experiment...could be 650 rwhp....a tick over 800 crank!
Bob DeVores method of dry sumping is still the best way to do it cost effectively, Mark A has had good success using Bobs method....use the native pump for pressure and a two stage for scavenge...not terribly hard to do.for a race car
Marc
DEVEK
Bob DeVores method of dry sumping is still the best way to do it cost effectively, Mark A has had good success using Bobs method....use the native pump for pressure and a two stage for scavenge...not terribly hard to do.for a race car
Marc
DEVEK
01-27-2004, 05:41 PM
#55
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OK. I think it's time we thought much more seroiusly about drysumps. As far as I can see, the most problematic is the cost of the scavenger pump(s). I believe they need to be electric, there's only so much you can run from a crank pulley ....
01-27-2004, 06:16 PM
#56
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Originally posted by Jim bailey - 928 International
Yes H the 928 pump is rather robust and does run at high pressure the blow off relief is at about 8 Bar . The casting of the oil passages into the upper face of the lower cradle of the block was rather innovative when the 928 engine was designed and eliminated a lot of machining/ drilling seen in many engines .
Yes H the 928 pump is rather robust and does run at high pressure the blow off relief is at about 8 Bar . The casting of the oil passages into the upper face of the lower cradle of the block was rather innovative when the 928 engine was designed and eliminated a lot of machining/ drilling seen in many engines .
From Marc T at Devek:
"...BTW, who do I have to ask if I add value to the 928 community or not? "
Well, don't waste your breath asking me........................
01-27-2004, 07:40 PM
#57
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Gretch the squirters are in the main block in the webbing at the base of each cylinder each has a hole drilled down to the main bearing . The squirters each have a "check valve" and only squirt when there is enough pressure (similar to a CIS fuel injector in that respect ) . Each main bearing has two holes to feed two cylinders . The "boat tailing" done on my 911 engine case was to machine away the "top" of the webs at the bottom of each cylinder at an angle , theory being the flat spots on the webbing bounce the oil /air back toward the piston . There is no doubt in my mind that dry sump is far better but space and $$ make that one a little hard to do for a street 928 with A/C . I have wondered if a deeper oil pan slightly wider in the front sump might not help with some of the oiling issues especially with a couple trap doors to help hold oil near the pickup but that too is just a bandaid .
01-27-2004, 10:52 PM
#58
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I love this thread. I have a spare oilpan. Let's make some mods! Jim I know you have one, yes that's an oilpan not a footrest Brother ;-) So, I also have a spare pickup. Now, I'm going to look for an electrical oilpump, but in the interim I bet we could extend that sump outwards, leaving the narrow neck ....
01-28-2004, 03:16 AM
#59
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Yes H the 928 pump is rather robust and does run at high pressure the blow off relief is at about 8 Bar .......
The casting of the oil passages into the upper face of the lower cradle of the block was rather innovative when the 928 engine was designed and eliminated a lot of machining/ drilling seen in many engines .
those are the channels in the bottom half of the block.
HTH
